Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3126
Fluor
FLR
$6.62B
| $739K | ﹤0.01% |
+14,111
| New | +$691K |
|
|
TMHC
3127
CALL
DELISTED
Taylor Morrison
TMHC
| $739K | ﹤0.01% |
+10,300
| New | +$654K |
|
3128
TE Connectivity
TEL
$62.9B
| $739K | ﹤0.01% |
+3,664
| New | +$781K |
|
|
FITB
3129
PUT
Fifth Third Bancorp
FITB
$46.9B
| $738K | ﹤0.01% |
13,100
-13,100
| -50% | -$664K |
|
3130
CALL
Synchrony
SYF
$23.4B
| $738K | ﹤0.01% |
9,700
-39,700
| -80% | -$2.92M |
|
3131
Ventas
VTR
$44.7B
| $737K | ﹤0.01% |
8,302
+2,253
| +37% | +$192K |
|
3132
CALL
Delek Logistics
DKL
$3.09B
| $737K | ﹤0.01% |
14,300
-1,200
| -8% | -$61K |
|
3133
Rayonier
RYN
$5.59B
| $736K | ﹤0.01% |
34,603
-19,482
| -36% | -$408K |
|
3134
CALL
Kodiak Gas Services
KGS
$5.38B
| $736K | ﹤0.01% |
9,800
+1,700
| +21% | +$116K |
|
3135
CALL
InterDigital
IDCC
$8.43B
| $736K | ﹤0.01% |
2,600
+1,100
| +73% | +$327K |
|
3136
PUT
Invesco DB US Dollar Index Bullish Fund
UUP
$423M
| $736K | ﹤0.01% |
25,900
-92,700
| -78% | -$2.57M |
|
3137
CALL
Cerence
CRNC
$355M
| $736K | ﹤0.01% |
65,000
+4,600
| +8% | +$45.1K |
|
3138
PUT
Merchants Bancorp
MBIN
$2.37B
| $735K | ﹤0.01% |
14,700
+7,000
| +91% | +$332K |
|
3139
PUT
IES Holdings
IESC
$12.8B
| $735K | ﹤0.01% |
+2,000
| New | +$646K |
|
3140
CALL
Sociedad Química y Minera de Chile
SQM
$18.8B
| $733K | ﹤0.01% |
9,900
-22,600
| -70% | -$1.89M |
|
|
ABVX
3141
PUT
Abivax
ABVX
$8.45B
| $733K | ﹤0.01% |
+5,500
| New | +$622K |
|
3142
CALL
CNX Resources
CNX
$4.75B
| $733K | ﹤0.01% |
21,600
+4,400
| +26% | +$159K |
|
3143
International Seaways
INSW
$5.34B
| $733K | ﹤0.01% |
+9,568
| New | +$776K |
|
3144
CALL
FLEX LNG
FLNG
$1.67B
| $732K | ﹤0.01% |
26,100
-1,100
| -4% | -$34K |
|
3145
PUT
Willis Towers Watson
WTW
$27.1B
| $732K | ﹤0.01% |
2,800
+600
| +27% | +$161K |
|
3146
PUT
DTE Energy
DTE
$25.2B
| $731K | ﹤0.01% |
4,800
+4,600
| +2,300% | +$672K |
|
|
SAIL
3147
PUT
SailPoint Inc
SAIL
$11.9B
| $731K | ﹤0.01% |
49,900
+48,700
| +4,058% | +$663K |
|
3148
CALL
James Hardie Industries
JHX
$14.7B
| $730K | ﹤0.01% |
27,900
+5,600
| +25% | +$123K |
|
3149
CALL
CTS Corp
CTS
$1.69B
| $730K | ﹤0.01% |
+11,200
| New | +$672K |
|
3150
Kinross Gold
KGC
$28.7B
| $729K | ﹤0.01% |
30,879
-109,930
| -78% | -$3.23M |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.